CVE-2026-77219 (GCVE-0-2026-77219)

Vulnerability from cvelistv5 – Published: 2026-08-21 20:20 – Updated: 2026-08-21 21:42 X_Open Source
VLAI
Title
GNU Emacs < 31.0.91 Heap Over-Read via PBM/PPM/PGM Image Loader
Summary
GNU Emacs before 31.0.91 contains an integer overflow in the PBM/PPM/PGM image loader that allows an attacker to leak heap memory contents by supplying a crafted image with large dimensions and an elevated max color index. The image loader multiplies image dimensions and channel count using signed integer arithmetic; for sufficiently large values, the result wraps to a negative number, bypassing the bounds check and causing the pixel reader to access heap memory past the end of the allocated buffer. The over-read contents are interpreted as pixel color values and rendered on screen.
Severity
6.9 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 21:32 UTC
CWE
  • CWE-190 - Integer Overflow or Wraparound
  • CWE-125 - Out-of-bounds Read
Assigner
References
Impacted products
Vendor Product Version CPE status
GNU Emacs Affected: 0 , < 31.0.91 (semver)
guessed Create a notification for this product.
Date Public
2026-07-01 00:00
Credits
Tristan Madani
Show details on NVD website
To clipboard 

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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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